How could you use coordinate geometry to prove line bd and line ac bisect one another

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.

Which of the following graphs could represent a quartic function?

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?